Sos-mediated cross-activation of wild-type Ras by oncogenic Ras is essential for tumorigenesis.

Sos-mediated cross-activation of wild-type Ras by oncogenic Ras is essential for tumorigenesis.
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DOI:
10.1038/ncomms2173
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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哺乳动物细胞含有三个密切相关的ras基因:H-ras、K-ras和N-ras。尽管在给定的肿瘤类型中,仅在一个 ras 基因中选择性地观察到致癌突变,但已证明转化表型的获得需要其他 ras 基因的正常产物的贡献。在这里,我们证明致癌 K-Ras 促进野生型 H- 和 N-Ras 的激活。这种激活是由致癌 K-Ras 依赖性 Sos 变构刺激介导的,并赋予含有癌细胞的致癌 K-Ras 生长优势。这些发现强调了肿瘤细胞中致癌型和野生型 Ras 的互补功能,并确定了针对 Ras 驱动的肿瘤的潜在新靶向策略。
Mammalian cells contain three closely related ras genes, H-ras, K-ras and N-ras. Although, in a given tumor type, oncogenic mutations are selectively observed in only one of the ras genes, the acquisition of the transformed phenotype has been shown to require the contribution of the normal products of the other ras genes. Here we demonstrate that oncogenic K-Ras promotes the activation of wild type H- and N-Ras. This activation is mediated by oncogenic K-Ras-dependent allosteric stimulation of Sos and confers a growth advantage to oncogenic K-Ras harboring cancer cells. These findings underscore the complementary functions of oncogenic and wild type Ras in tumor cells and identify a potential new targeting strategy for Ras-driven tumors.
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